Question 7(i)(a) State why ethyne burns in oxygen with a sooty flame?(b) Write the balanced chemical equation when water is added to calcium carbide.

Question

Accepted Answer

(a) Ethyne being a hydrocarbon contains carbon hence, all the carbon particles do not oxidise completely. Thus, it burns with sooty flame.

(b) $\underset{\text{calcium carbide}}{\text{CaC}_2} + \underset{\text{water}}{2\text{H}_2\text{O}} \longrightarrow \underset{\text{ethyne [acetylene]}}{\text{C}_2\text{H}_2} + \text{Ca(OH)}_2$

Solved Sample Paper 2 — Question 17

Question 7(i)